Just about every class is good for this brawl because your deck should be centered around a few concepts:
lots of deathrattles
lots of minions
minions with inflated mana costs to balance their battle cry
minions 1 cost or less spawn nothing, 2 only spawn target dummy(kinda useful) or wisp
Take a look through your cards, a lot of neutrals fit those requirements perfectly. Bomb lobber, kodo, sludge belcher, sea giant(death rattle summons a 6 even if played at reduced cost), lil exorcist, argus, mct, knife juggler, are all great for this brawl, and there's easily more. Druid works best though because it can ramp past an awkward mana curve and it has the best spells for buffing hordes of minions.